31400051 has 4 divisors (see below), whose sum is σ = 31797600. Its totient is φ = 31002504.

The previous prime is 31400029. The next prime is 31400053. The reversal of 31400051 is 15000413.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31400051 - 2²² = 27205747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31399999 and 31400035.

It is not an unprimeable number, because it can be changed into a prime (31400053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198656 + ... + 198813.

It is an arithmetic number, because the mean of its divisors is an integer number (7949400).

Almost surely, 2^31400051 is an apocalyptic number.

31400051 is a deficient number, since it is larger than the sum of its proper divisors (397549).

31400051 is an equidigital number, since it uses as much as digits as its factorization.

31400051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397548.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 31400051 is about 5603.5748411171. The cubic root of 31400051 is about 315.4835974906.

Adding to 31400051 its reverse (15000413), we get a palindrome (46400464).

The spelling of 31400051 in words is "thirty-one million, four hundred thousand, fifty-one".